A color movie, Circa 80s or 90s? I only remember this caveman sitting down to take a break at a tree,he sees some little blue flowers so he eats one, and then another and another, and he starts tripping out, laughing and laughing. Later, after regaining consciousness, wrinkles his nose at those terrible flowers and walks away.
Caveman (1981)?
https://www.imdb.com/title/tt0082146/
in this case the movie script won’t help me lol. searching for Content I see the caveman discover marijuana, but that is not the little blue hallucinogenic flowers that I saw. I’m not going to watch this whole movie to figure it out it looks pretty terrible lol. still unsolved.
LOL! Yeah, it’s still one of the worst movies ever.